1 (3 to 4 lb.) roast beef
1 (16 oz.) ketchup
1 c. Coke
1 pkg. onion soup mix

Cut up chunks of beef, put in crockpot. Add rest of ingredients. Cook 6 to 8 hours. Take meat out, tear with fork, put back into crockpot. Cook until hot.

Serve on hamburger buns.